Question about Hyundai Santa Fe
Posted by Anonymous on
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Posted on Jan 02, 2017
it is the Transmission Control Unit. you have to find the reason why the TCU is flashing the D4 fault code. not replace the unit. have your vehicle scanned for another code. your transmission or transaxle is giving you a warning that something is wrong .
Posted on Nov 21, 2008
pburcham: In studying up on your problem, I could only come up with a few possibilities from your description.
1. Linkage adjustment
2. A problem with the "Low and reverse Brake band"
however, this usually has a symptom of poor acceleration
due to the transmission slipping. That band has to grab the drum to hold for low gear.
3. Problem with the manual valve in the valve body.
4. Damaged seals causing pressure leakage which will keep the clutches from locking up.
5.Defective "High Reverse clutch" (front) check ball
Possibly a few other things, but everything (unfortunately) is still internal. The inhibitor switch is for the starting circuit and just keeps you from starting the car in anything but park and neutral.
Transmission control unit will not have this harsh an effect. It should operate without the TCU. You should be able to do a manuel shift with the transmission.
Sorry I couldn't be of more help.
I can say one thing, these transmissions were not known for failures, consequently should be a dime a dozen in salvage yards.
Why or how you got a bad one?????? Don't know?
If I can help, let me know........
Posted on Apr 23, 2009
You have a solenoid bad in the trans. Will need to drop the pan to replace part. Most likely a code is stored in the computer to help direct the technician.
Posted on Jul 14, 2009
Ck the transmission modulator before doing anything else. It's on the back of the trans and operates by a vacuum hose from the engine.**** on it with a vacuum tool and see if it's working. If it fails a vacuum test, Replace it. Theres a rod that goes in it so pay close attention. OR take it to a shop , have the oil and filter changed along with the modulator. That's the safest and easiest thing to do. Do not take it to AAMCO. or the like. Seems they need to overhaul it to tell you if it needed to be overhauled. Good Luck, Ned
Posted on Sep 09, 2009
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